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java.nio
Class ByteBuffer

java.lang.Object sample code for java.lang.Object definition code for java.lang.Object 
  extended by java.nio.Buffer sample code for java.nio.Buffer definition code for java.nio.Buffer 
      extended by java.nio.ByteBuffer
All Implemented Interfaces:
Comparable sample code for java.lang.Comparable definition code for java.lang.Comparable <ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer >
Direct Known Subclasses:
MappedByteBuffer sample code for java.nio.MappedByteBuffer definition code for java.nio.MappedByteBuffer 
public abstract class ByteBuffer
extends Buffer sample code for java.nio.Buffer definition code for java.nio.Buffer 
implements Comparable sample code for java.lang.Comparable definition code for java.lang.Comparable <ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer >

A byte buffer.

This class defines six categories of operations upon byte buffers:

Byte buffers can be created either by allocation sample code for java.nio.ByteBuffer.allocate(int) definition code for java.nio.ByteBuffer.allocate(int) , which allocates space for the buffer's content, or by wrapping sample code for java.nio.ByteBuffer.wrap(byte[]) definition code for java.nio.ByteBuffer.wrap(byte[]) an existing byte array into a buffer.

Direct vs. non-direct buffers

A byte buffer is either direct or non-direct. Given a direct byte buffer, the Java virtual machine will make a best effort to perform native I/O operations directly upon it. That is, it will attempt to avoid copying the buffer's content to (or from) an intermediate buffer before (or after) each invocation of one of the underlying operating system's native I/O operations.

A direct byte buffer may be created by invoking the allocateDirect sample code for java.nio.ByteBuffer.allocateDirect(int) definition code for java.nio.ByteBuffer.allocateDirect(int) factory method of this class. The buffers returned by this method typically have somewhat higher allocation and deallocation costs than non-direct buffers. The contents of direct buffers may reside outside of the normal garbage-collected heap, and so their impact upon the memory footprint of an application might not be obvious. It is therefore recommended that direct buffers be allocated primarily for large, long-lived buffers that are subject to the underlying system's native I/O operations. In general it is best to allocate direct buffers only when they yield a measureable gain in program performance.

A direct byte buffer may also be created by mapping sample code for java.nio.channels.FileChannel.map(java.nio.channels.FileChannel.MapMode, long, long) definition code for java.nio.channels.FileChannel.map(java.nio.channels.FileChannel.MapMode, long, long) a region of a file directly into memory. An implementation of the Java platform may optionally support the creation of direct byte buffers from native code via JNI. If an instance of one of these kinds of buffers refers to an inaccessible region of memory then an attempt to access that region will not change the buffer's content and will cause an unspecified exception to be thrown either at the time of the access or at some later time.

Whether a byte buffer is direct or non-direct may be determined by invoking its isDirect sample code for java.nio.ByteBuffer.isDirect() definition code for java.nio.ByteBuffer.isDirect() method. This method is provided so that explicit buffer management can be done in performance-critical code.

Access to binary data

This class defines methods for reading and writing values of all other primitive types, except boolean. Primitive values are translated to (or from) sequences of bytes according to the buffer's current byte order, which may be retrieved and modified via the order sample code for java.nio.ByteBuffer.order() definition code for java.nio.ByteBuffer.order() methods. Specific byte orders are represented by instances of the ByteOrder sample code for java.nio.ByteOrder definition code for java.nio.ByteOrder class. The initial order of a byte buffer is always BIG_ENDIAN sample code for java.nio.ByteOrder.BIG_ENDIAN definition code for java.nio.ByteOrder.BIG_ENDIAN .

For access to heterogeneous binary data, that is, sequences of values of different types, this class defines a family of absolute and relative get and put methods for each type. For 32-bit floating-point values, for example, this class defines: 

 float  getFloat() sample code for java.nio.ByteBuffer.getFloat() definition code for java.nio.ByteBuffer.getFloat() 
 float  getFloat(int index) sample code for java.nio.ByteBuffer.getFloat(int) definition code for java.nio.ByteBuffer.getFloat(int) 
  void  putFloat(float f) sample code for java.nio.ByteBuffer.putFloat(float) definition code for java.nio.ByteBuffer.putFloat(float) 
  void  putFloat(int index, float f) sample code for java.nio.ByteBuffer.putFloat(int, float) definition code for java.nio.ByteBuffer.putFloat(int, float)

Corresponding methods are defined for the types char, short, int, long, and double. The index parameters of the absolute get and put methods are in terms of bytes rather than of the type being read or written.

For access to homogeneous binary data, that is, sequences of values of the same type, this class defines methods that can create views of a given byte buffer. A view buffer is simply another buffer whose content is backed by the byte buffer. Changes to the byte buffer's content will be visible in the view buffer, and vice versa; the two buffers' position, limit, and mark values are independent. The asFloatBuffer sample code for java.nio.ByteBuffer.asFloatBuffer() definition code for java.nio.ByteBuffer.asFloatBuffer() method, for example, creates an instance of the FloatBuffer sample code for java.nio.FloatBuffer definition code for java.nio.FloatBuffer class that is backed by the byte buffer upon which the method is invoked. Corresponding view-creation methods are defined for the types char, short, int, long, and double.

View buffers have three important advantages over the families of type-specific get and put methods described above:

The byte order of a view buffer is fixed to be that of its byte buffer at the time that the view is created.

Invocation chaining

Methods in this class that do not otherwise have a value to return are specified to return the buffer upon which they are invoked. This allows method invocations to be chained. The sequence of statements 

 bb.putInt(0xCAFEBABE);
 bb.putShort(3);
 bb.putShort(45);
can, for example, be replaced by the single statement 
 bb.putInt(0xCAFEBABE).putShort(3).putShort(45);

Since:
1.4

Method Summary
static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer allocate sample code for java.nio.ByteBuffer.allocate(int) definition code for java.nio.ByteBuffer.allocate(int) (int capacity)
          Allocates a new byte buffer.
static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer allocateDirect sample code for java.nio.ByteBuffer.allocateDirect(int) definition code for java.nio.ByteBuffer.allocateDirect(int) (int capacity)
          Allocates a new direct byte buffer.
 byte[] array sample code for java.nio.ByteBuffer.array() definition code for java.nio.ByteBuffer.array() ()
          Returns the byte array that backs this buffer  (optional operation).
 int arrayOffset sample code for java.nio.ByteBuffer.arrayOffset() definition code for java.nio.ByteBuffer.arrayOffset() ()
          Returns the offset within this buffer's backing array of the first element of the buffer  (optional operation).
abstract  CharBuffer sample code for java.nio.CharBuffer definition code for java.nio.CharBuffer asCharBuffer sample code for java.nio.ByteBuffer.asCharBuffer() definition code for java.nio.ByteBuffer.asCharBuffer() ()
          Creates a view of this byte buffer as a char buffer.
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer asDoubleBuffer sample code for java.nio.ByteBuffer.asDoubleBuffer() definition code for java.nio.ByteBuffer.asDoubleBuffer() ()
          Creates a view of this byte buffer as a double buffer.
abstract  FloatBuffer sample code for java.nio.FloatBuffer definition code for java.nio.FloatBuffer asFloatBuffer sample code for java.nio.ByteBuffer.asFloatBuffer() definition code for java.nio.ByteBuffer.asFloatBuffer() ()
          Creates a view of this byte buffer as a float buffer.
abstract  IntBuffer sample code for java.nio.IntBuffer definition code for java.nio.IntBuffer asIntBuffer sample code for java.nio.ByteBuffer.asIntBuffer() definition code for java.nio.ByteBuffer.asIntBuffer() ()
          Creates a view of this byte buffer as an int buffer.
abstract  LongBuffer sample code for java.nio.LongBuffer definition code for java.nio.LongBuffer asLongBuffer sample code for java.nio.ByteBuffer.asLongBuffer() definition code for java.nio.ByteBuffer.asLongBuffer() ()
          Creates a view of this byte buffer as a long buffer.
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer asReadOnlyBuffer sample code for java.nio.ByteBuffer.asReadOnlyBuffer() definition code for java.nio.ByteBuffer.asReadOnlyBuffer() ()
          Creates a new, read-only byte buffer that shares this buffer's content.
abstract  ShortBuffer sample code for java.nio.ShortBuffer definition code for java.nio.ShortBuffer asShortBuffer sample code for java.nio.ByteBuffer.asShortBuffer() definition code for java.nio.ByteBuffer.asShortBuffer() ()
          Creates a view of this byte buffer as a short buffer.
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer compact sample code for java.nio.ByteBuffer.compact() definition code for java.nio.ByteBuffer.compact() ()
          Compacts this buffer  (optional operation).
 int compareTo sample code for java.nio.ByteBuffer.compareTo(java.nio.ByteBuffer) definition code for java.nio.ByteBuffer.compareTo(java.nio.ByteBuffer) (ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer  that)
          Compares this buffer to another.
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer duplicate sample code for java.nio.ByteBuffer.duplicate() definition code for java.nio.ByteBuffer.duplicate() ()
          Creates a new byte buffer that shares this buffer's content.
 boolean equals sample code for java.nio.ByteBuffer.equals(java.lang.Object) definition code for java.nio.ByteBuffer.equals(java.lang.Object) (Object sample code for java.lang.Object definition code for java.lang.Object  ob)
          Tells whether or not this buffer is equal to another object.
abstract  byte get sample code for java.nio.ByteBuffer.get() definition code for java.nio.ByteBuffer.get() ()
          Relative get method.
 ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer get sample code for java.nio.ByteBuffer.get(byte[]) definition code for java.nio.ByteBuffer.get(byte[]) (byte[] dst)
          Relative bulk get method.
 ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer get sample code for java.nio.ByteBuffer.get(byte[], int, int) definition code for java.nio.ByteBuffer.get(byte[], int, int) (byte[] dst, int offset, int length)
          Relative bulk get method.
abstract  byte get sample code for java.nio.ByteBuffer.get(int) definition code for java.nio.ByteBuffer.get(int) (int index)
          Absolute get method.
abstract  char getChar sample code for java.nio.ByteBuffer.getChar() definition code for java.nio.ByteBuffer.getChar() ()
          Relative get method for reading a char value.
abstract  char getChar sample code for java.nio.ByteBuffer.getChar(int) definition code for java.nio.ByteBuffer.getChar(int) (int index)
          Absolute get method for reading a char value.
abstract  double getDouble sample code for java.nio.ByteBuffer.getDouble() definition code for java.nio.ByteBuffer.getDouble() ()
          Relative get method for reading a double value.
abstract  double getDouble sample code for java.nio.ByteBuffer.getDouble(int) definition code for java.nio.ByteBuffer.getDouble(int) (int index)
          Absolute get method for reading a double value.
abstract  float getFloat sample code for java.nio.ByteBuffer.getFloat() definition code for java.nio.ByteBuffer.getFloat() ()
          Relative get method for reading a float value.
abstract  float getFloat sample code for java.nio.ByteBuffer.getFloat(int) definition code for java.nio.ByteBuffer.getFloat(int) (int index)
          Absolute get method for reading a float value.
abstract  int getInt sample code for java.nio.ByteBuffer.getInt() definition code for java.nio.ByteBuffer.getInt() ()
          Relative get method for reading an int value.
abstract  int getInt sample code for java.nio.ByteBuffer.getInt(int) definition code for java.nio.ByteBuffer.getInt(int) (int index)
          Absolute get method for reading an int value.
abstract  long getLong sample code for java.nio.ByteBuffer.getLong() definition code for java.nio.ByteBuffer.getLong() ()
          Relative get method for reading a long value.
abstract  long getLong sample code for java.nio.ByteBuffer.getLong(int) definition code for java.nio.ByteBuffer.getLong(int) (int index)
          Absolute get method for reading a long value.
abstract  short getShort sample code for java.nio.ByteBuffer.getShort() definition code for java.nio.ByteBuffer.getShort() ()
          Relative get method for reading a short value.
abstract  short getShort sample code for java.nio.ByteBuffer.getShort(int) definition code for java.nio.ByteBuffer.getShort(int) (int index)
          Absolute get method for reading a short value.
 boolean hasArray sample code for java.nio.ByteBuffer.hasArray() definition code for java.nio.ByteBuffer.hasArray() ()
          Tells whether or not this buffer is backed by an accessible byte array.
 int hashCode sample code for java.nio.ByteBuffer.hashCode() definition code for java.nio.ByteBuffer.hashCode() ()
          Returns the current hash code of this buffer.
abstract  boolean isDirect sample code for java.nio.ByteBuffer.isDirect() definition code for java.nio.ByteBuffer.isDirect() ()
          Tells whether or not this byte buffer is direct.
 ByteOrder sample code for java.nio.ByteOrder definition code for java.nio.ByteOrder order sample code for java.nio.ByteBuffer.order() definition code for java.nio.ByteBuffer.order() ()
          Retrieves this buffer's byte order.
 ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer order sample code for java.nio.ByteBuffer.order(java.nio.ByteOrder) definition code for java.nio.ByteBuffer.order(java.nio.ByteOrder) (ByteOrder sample code for java.nio.ByteOrder definition code for java.nio.ByteOrder  bo)
          Modifies this buffer's byte order.
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer put sample code for java.nio.ByteBuffer.put(byte) definition code for java.nio.ByteBuffer.put(byte) (byte b)
          Relative put method  (optional operation).
 ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer put sample code for java.nio.ByteBuffer.put(byte[]) definition code for java.nio.ByteBuffer.put(byte[]) (byte[] src)
          Relative bulk put method  (optional operation).
 ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer put sample code for java.nio.ByteBuffer.put(byte[], int, int) definition code for java.nio.ByteBuffer.put(byte[], int, int) (byte[] src, int offset, int length)
          Relative bulk put method  (optional operation).
 ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer put sample code for java.nio.ByteBuffer.put(java.nio.ByteBuffer) definition code for java.nio.ByteBuffer.put(java.nio.ByteBuffer) (ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer  src)
          Relative bulk put method  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer put sample code for java.nio.ByteBuffer.put(int, byte) definition code for java.nio.ByteBuffer.put(int, byte) (int index, byte b)
          Absolute put method  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putChar sample code for java.nio.ByteBuffer.putChar(char) definition code for java.nio.ByteBuffer.putChar(char) (char value)
          Relative put method for writing a char value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putChar sample code for java.nio.ByteBuffer.putChar(int, char) definition code for java.nio.ByteBuffer.putChar(int, char) (int index, char value)
          Absolute put method for writing a char value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putDouble sample code for java.nio.ByteBuffer.putDouble(double) definition code for java.nio.ByteBuffer.putDouble(double) (double value)
          Relative put method for writing a double value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putDouble sample code for java.nio.ByteBuffer.putDouble(int, double) definition code for java.nio.ByteBuffer.putDouble(int, double) (int index, double value)
          Absolute put method for writing a double value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putFloat sample code for java.nio.ByteBuffer.putFloat(float) definition code for java.nio.ByteBuffer.putFloat(float) (float value)
          Relative put method for writing a float value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putFloat sample code for java.nio.ByteBuffer.putFloat(int, float) definition code for java.nio.ByteBuffer.putFloat(int, float) (int index, float value)
          Absolute put method for writing a float value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putInt sample code for java.nio.ByteBuffer.putInt(int) definition code for java.nio.ByteBuffer.putInt(int) (int value)
          Relative put method for writing an int value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putInt sample code for java.nio.ByteBuffer.putInt(int, int) definition code for java.nio.ByteBuffer.putInt(int, int) (int index, int value)
          Absolute put method for writing an int value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putLong sample code for java.nio.ByteBuffer.putLong(int, long) definition code for java.nio.ByteBuffer.putLong(int, long) (int index, long value)
          Absolute put method for writing a long value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putLong sample code for java.nio.ByteBuffer.putLong(long) definition code for java.nio.ByteBuffer.putLong(long) (long value)
          Relative put method for writing a long value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putShort sample code for java.nio.ByteBuffer.putShort(int, short) definition code for java.nio.ByteBuffer.putShort(int, short) (int index, short value)
          Absolute put method for writing a short value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer putShort sample code for java.nio.ByteBuffer.putShort(short) definition code for java.nio.ByteBuffer.putShort(short) (short value)
          Relative put method for writing a short value  (optional operation).
abstract  ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer slice sample code for java.nio.ByteBuffer.slice() definition code for java.nio.ByteBuffer.slice() ()
          Creates a new byte buffer whose content is a shared subsequence of this buffer's content.
 String sample code for java.lang.String definition code for java.lang.String toString sample code for java.nio.ByteBuffer.toString() definition code for java.nio.ByteBuffer.toString() ()
          Returns a string summarizing the state of this buffer.
static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer wrap sample code for java.nio.ByteBuffer.wrap(byte[]) definition code for java.nio.ByteBuffer.wrap(byte[]) (byte[] array)
          Wraps a byte array into a buffer.
static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer wrap sample code for java.nio.ByteBuffer.wrap(byte[], int, int) definition code for java.nio.ByteBuffer.wrap(byte[], int, int) (byte[] array, int offset, int length)
          Wraps a byte array into a buffer.
 
Methods inherited from class java.nio.Buffer sample code for java.nio.Buffer definition code for java.nio.Buffer
capacity sample code for java.nio.Buffer.capacity() definition code for java.nio.Buffer.capacity() , clear sample code for java.nio.Buffer.clear() definition code for java.nio.Buffer.clear() , flip sample code for java.nio.Buffer.flip() definition code for java.nio.Buffer.flip() , hasRemaining sample code for java.nio.Buffer.hasRemaining() definition code for java.nio.Buffer.hasRemaining() , isReadOnly sample code for java.nio.Buffer.isReadOnly() definition code for java.nio.Buffer.isReadOnly() , limit sample code for java.nio.Buffer.limit() definition code for java.nio.Buffer.limit() , limit sample code for java.nio.Buffer.limit(int) definition code for java.nio.Buffer.limit(int) , mark sample code for java.nio.Buffer.mark() definition code for java.nio.Buffer.mark() , position sample code for java.nio.Buffer.position() definition code for java.nio.Buffer.position() , position sample code for java.nio.Buffer.position(int) definition code for java.nio.Buffer.position(int) , remaining sample code for java.nio.Buffer.remaining() definition code for java.nio.Buffer.remaining() , reset sample code for java.nio.Buffer.reset() definition code for java.nio.Buffer.reset() , rewind sample code for java.nio.Buffer.rewind() definition code for java.nio.Buffer.rewind()
 
Methods inherited from class java.lang.Object sample code for java.lang.Object definition code for java.lang.Object
clone sample code for java.lang.Object.clone() definition code for java.lang.Object.clone() , finalize sample code for java.lang.Object.finalize() definition code for java.lang.Object.finalize() , getClass sample code for java.lang.Object.getClass() definition code for java.lang.Object.getClass() , notify sample code for java.lang.Object.notify() definition code for java.lang.Object.notify() , notifyAll sample code for java.lang.Object.notifyAll() definition code for java.lang.Object.notifyAll() , wait sample code for java.lang.Object.wait() definition code for java.lang.Object.wait() , wait sample code for java.lang.Object.wait(long) definition code for java.lang.Object.wait(long) , wait sample code for java.lang.Object.wait(long, int) definition code for java.lang.Object.wait(long, int)
 

Method Detail

allocateDirect sample code for java.nio.ByteBuffer.allocateDirect(int) definition code for java.nio.ByteBuffer.allocateDirect(int) 

public static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer  allocateDirect(int capacity)
Allocates a new direct byte buffer.

The new buffer's position will be zero, its limit will be its capacity, and its mark will be undefined. Whether or not it has a backing array sample code for java.nio.ByteBuffer.hasArray() definition code for java.nio.ByteBuffer.hasArray() is unspecified.

Parameters:
capacity - The new buffer's capacity, in bytes
Returns:
The new byte buffer
Throws:
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - If the capacity is a negative integer

allocate sample code for java.nio.ByteBuffer.allocate(int) definition code for java.nio.ByteBuffer.allocate(int) 

public static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer  allocate(int capacity)
Allocates a new byte buffer.

The new buffer's position will be zero, its limit will be its capacity, and its mark will be undefined. It will have a backing array sample code for java.nio.ByteBuffer.array() definition code for java.nio.ByteBuffer.array() , and its array offset sample code for java.nio.ByteBuffer.arrayOffset() definition code for java.nio.ByteBuffer.arrayOffset() will be zero.

Parameters:
capacity - The new buffer's capacity, in bytes
Returns:
The new byte buffer
Throws:
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - If the capacity is a negative integer

wrap sample code for java.nio.ByteBuffer.wrap(byte[], int, int) definition code for java.nio.ByteBuffer.wrap(byte[], int, int) 

public static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer  wrap(byte[] array,
                              int offset,
                              int length)
Wraps a byte array into a buffer.

The new buffer will be backed by the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity will be array.length, its position will be offset, its limit will be offset + length, and its mark will be undefined. Its backing array sample code for java.nio.ByteBuffer.array() definition code for java.nio.ByteBuffer.array() will be the given array, and its array offset sample code for java.nio.ByteBuffer.arrayOffset() definition code for java.nio.ByteBuffer.arrayOffset() will be zero.

Parameters:
array - The array that will back the new buffer
offset - The offset of the subarray to be used; must be non-negative and no larger than array.length. The new buffer's position will be set to this value.
length - The length of the subarray to be used; must be non-negative and no larger than array.length - offset. The new buffer's limit will be set to offset + length.
Returns:
The new byte buffer
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

wrap sample code for java.nio.ByteBuffer.wrap(byte[]) definition code for java.nio.ByteBuffer.wrap(byte[]) 

public static ByteBuffer sample code for java.nio.ByteBuffer definition code for java.nio.ByteBuffer  wrap(byte[] array)
Wraps a byte array into a buffer.

The new buffer will be backed by the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity and limit will be array.length, its position will be zero, and its mark will be undefined. Its backing array